Sergey sniffed his bulbous nose and pointed at the slightly smelly paint on the wall, saying, "Our opponents are very formidable. They never waste their efforts, but this is just a waste of effort...
Using this smell combined with the impact of blood on the scene can mislead those who come to investigate."
As he spoke, Sergey tapped his nose and said, "As long as you can guess the opponent's intention, you know they're trying to cover up some fresh scent, luckily my nose is quite sensitive..."
Garci quickly reviewed the footage from the camera, and though he didn't comment on Sergey's conclusion, his actions implicitly acknowledged it.
The old man went to the edge of the sofa where two kidnapped guys had been lying, crouched with some difficulty to examine closely, and then took out a small plastic bag and tweezers to collect some black leather-like bits from the sofa.
